With nearly 200 small tremors giving Southern California a jiggle earlier in the week, the California Office of Emergency Services has issued an earthquake advisory for the region.

The warning advises residents and officials in Ventura, San Diego, San Bernardino, Riverside, Orange, Los Angeles, Kern and Imperial counties -- all along the southern section of the San Andreas Fault -- to be prepared.

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The earthquake swarm striking the Salton Sea area beginning Monday morning included three tremors of a magnitude greater than 4 and may slightly increase the probability of an additional earthquake as large or larger than 4.3 by 0.03 to 1 percent in Southern California through Oct. 4.

"California is earthquake country. We must always be prepared and not let our guard down," said Cal OES Director Mark Ghilarducci in a statement. "The threat of an earthquake on the San Andreas Fault hasn't gone away, so this is another important opportunity for us to revisit our emergency plans and learn what steps you need to take if a significant earthquake hits.